I like the dark but goofy style.
Timing the attack animations is fun, as is dodging projectiles. However, maybe I'm just unlucky, but far too much of this early game was kiting around >5-enemy trap room squads around corners so that I could single them out and chip them down, and that's just annoying.
Moving the shortcut number icon to an upper corner would make it clearer that's the shortcut key and not the number of items I have.
The item highlight button looks more like an inventory than the inventory button in both its location and icon.
Sound controls appear to not work, at least for the menu music.
I have mixed feelings about the leveling up heal as it feels wrong to be using it intentionally as such a huge boost to healing in a game with generatively limited resources. "I feel stronger" is a very soulful level up message.
Sometimes an item will be highlighted when my cursor is not over it. Dragging my cursor over it then makes the character start and stop moving repeatedly. That seems to happen near walls.
The game froze on me while trying to load a previous floor at one point. I can't climb up the stairs to floor 3 after the guardian - my character walks into (yes into) the stairs and nothing happens.